OPENLY gay GAA star Conor Cusack has responded to Dublin footballer Ger Brennan's decision to go public on his support for a 'No' vote in the same-sex referendum.

Brennan said he's voting no arguing that a change in the law will "redefine marriage" and that this is "obviously going to affect children".

Asked about the Dublin player's view that a mother and father is the ideal family unit, Cusack said there was "nothing simple about family life."

"I'd absolutely love to live in an ideal world, but that's not the reality of life. Life is complex, life is messy, and the strength of any society is how it embraces that complexity," said the Cork hurler.